A crash from the outside, followed by a yell, cut him short; then blow after blow shook the doors, until there came a sharp snap, a clinking of metal and a triangular bit of iron fell inwards, leaving a hole through which struggled a ray of light.

Instantly West knelt, and shoving his revolver through the aperture fired every cartridge. For a moment the alley resounded with the racket of the revolver, then absolute silence followed.

Presently a single questioning blow fell upon the door, and a moment later another and another, and then a sudden crack zigzagged across the iron plate.

“Here,” said West, seizing Colette by the wrist, “you follow me, Braith!” and he ran swiftly toward a circular spot of light at the further end of the cellar. The spot of light came from a barred manhole above. West motioned Braith to mount on his shoulders.

“Push it over. You must !”